Method for forming battery cell

Abstract

In a first aspect, the present disclosure relates to a method of forming a battery cell, the method comprising:-in a battery cell, the battery cell comprising a carbon-containing anode, a sodium-containing cathode and an electrolyte solution comprising an alkali metal bis (oxalato) borate and an organic solvent wherein the alkali metal ions are selected from sodium (Na +) and potassium (K +), the organic solvent comprises a pyrrolidone and / or phosphate compound,-performing a first formation cycle by fully charging and discharging the battery cell, and-performing a second formation cycle by fully charging and discharging the battery cell; -wherein the formation cycle is from gt; the method is carried out at a temperature in the range of 25 DEG C to 100 DEG C. The present disclosure also relates to a method of forming a battery cell, comprising the steps of:-performing a first step of charging the battery cell at a C-rate in the range of 0.5 C to 20 C; and-performing a second step of constant voltage (CV) charging at a voltage higher than the decomposition potential of the electrolyte salt for a period of time until a C-rate current range of 0.02 C to 4C is reached.

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